Make room for the other version
Ask what the other person understood before assuming that you are arguing about the same facts. For a message about how to resolve a money dispute with a friend, use this factual base: use one or two recent examples and name the trust, effort, money, or inclusion issue they created.
Correct the record precisely
Correct only what you can support, acknowledge any real impact, and propose a practical way to prevent repetition. Ask how your friend understood the situation and propose one change that can be tested. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Agree on a testable next step
Do not assemble mutual friends, post indirect messages, or use confidential information as evidence. Stop direct contact and use appropriate support when there are threats, stalking, coercion, or safety concerns. Do not recruit an audience, publish private evidence, or turn a misunderstanding into a campaign about character.